他突然站起来，什么都没说就离开了。

He stood up and ___popped off without a word.

经理批评他时，他突然发火顶撞了回去。

He ___popped off at the manager when receiving criticism.

他前两天突然就走了，大家都没想到。

He ___popped off the other day, and no one saw it coming.